In the most precise study yet on vegetation growth trends across North America, researchers from NASA have found that nearly a third of the land cover in Canada and Alaska has greened in recent decades as a result of climate change. The researchers also found that, while vegetation productivity is on the rise in the tundra regions of the continent, warming temperatures might be having the opposite effect on the Boreal forest, which showed some signs of browning. Overall, three per cent of the land experienced vegetation decline. http://news.nationalpost.com/news/w...-and-its-boreal-forest-brown-nasa-study-finds AFAIK the boreal forest would do better at offsetting carbon, while tundra has a lot of greenhouse gas trapped under ice. I wonder how many people are aware of the potential methane thaw problem and how big that problem is in speeding up the climate change and making things worse?